Jim: Your suggestion will work if the axles are long enough. That is how I dualed my 560, as did a lot of folks with the older dished cast wheels. With those one could dish the inside wheel in and outside wheel out. As I recall with my 560 there was very little more than enough axle length to do this with 16.9x38 inside and 14.6x38 on outside. My inside tire was less than 2" from fender and outside hub was flush with end of the axle, and the tires were about 2" apart. Now, I've seen guys do this with 13.6 on 300, 400, etc. with loads of room. Course those axles were same length as 560. Your 826 even with standard axle will be 6" longer each side than 560.
On my 1066 with factory axle duals, my inside tire was 3" from cab, tires were 4" apart and dual hubs were almost flush with end of axle. That was with two 20.8x38. I know 766 and 1066 standard axles were same length, thus I assume your 826 is the same or longer if it has optional axles. You might just be able to do this using 16.9 tires, each tire being close to 4" inches narrower than 20.8 tires.
Pour yourself a second cup, grab the yard stick, a 5 gallon pail to sit on, pencil, paper and calculator if necessary. Got out and park yourself at end of 826 axle. Place the yard stick through wheel to the fender, record the distance from fender to end of axle. Then calculate the maximum offset you can achive with rim bead and changing clamps to outside of wheel. I'm thinking of outside wheel in doing this, and when you figure the calculations for maximum dish for outside wheel, imagine it being at end of axle. From there you decide if there is enough room for an inside tire between it and fender. You don't need to worry about hubs, axle is lots long for two. Just be certain you have 5" more space than width of tire to allow a bit of clearence between tires and tire and fender.
Back when I dualed my 560 that is exactly how I had to calculate this. I spent the better part of Sun. afternoon parked beside tractor calculating where that tire would be if at end of axle with maximum dish. Back in 1976 I didn't have YT and a computer to ask questions. As I recall I couldn't have achived this with 2 16.9x38.
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